Coated paper



Patented Apr. 7, 1953 UNITED STATES PATENT OFFICE- 2,634,220 COATED PAPER 2 Benjamin J. Oriel, New York; N. Y. No Drawingn. Application December. 29, 19 4 9; Serial No. 135,851 1v Claim; (01.117-154) 1. V This invention relates generally to apemovs. and more particularly to toy typ'ewriter paper with whitewashable paper surface. My ob ectis to provide simple, inexpensive, repeatedly usable tay tyrewmer equipment, The use of this paper, which the whitewa'shable coating is disposed uniformly, provides greater amusement opera use; and manipulation H According to the methods hitherto known there are" already ayailable special typewriter r1705 prepared with a special chemical ink; such that typewriter face produced with it will disappea-r nomthe paper surface after application and trjeatment two difierent eradicator fluids. However, despite; the prescribed use of a blotting paper, the eradicated surface dries slowly, and the corrosive effect of the eradicator fluids changes the eradicated partof the paper face i' remwhite to yellowish color; consequently the paper wrinkles if special parchment or fine paper is not us d; Therefore, the use-of such eradicatoi-s fluids with special new typewriter ribbons could not replace the use of a rubber eraser until HOWL Q liowerer, there was no known method which would allow the possibility of erasing the typewriter 'face simple water instead of by rubber eraser er chemical eradication fluids; Nevertheless, any type'writer face produced by typing through any usual typewriter ribbon upon t su' ace oi a paper coated with whitewashable coating, which I apply for carrying out my invention, can be erased simply by the use Of water.

As described alcove, it is. the Object of this vention to provide a disposable paper having its surface impregnated with a: coating. whitewashable with water{ which may be legibly typewritten upon with any usual ty ewriter ribbon and after that, as desired, eradicated i'n part or whole with simple water"; that is, lo'yrubbin'g it slightly withasmall piece of wet cotton or a small wet rag. Then. the eradicated part of the paper surface will dryup quickly, and the words desired can soon be retyped, or after whitewashin the whole surface of the paper with water, as soon as it dr iescan be used again instead of another new pa y H rore'gtmgt ana other'objects and seventag o the inveatienwn e mere apparent'i'rom readi e detailed" description in the renewing partiof the specification.

The invention comprises generally a combination or-usual. writing paper or typewriter paper,

provi'd 'with a whitewashable surface coating.

This coating i's forinedwithsuch a 'eest'm tum position that itsQcor si'stency isreceptiye' typewriter face obtained with any usual writer ribbon, which face" will remain l'gl ie under diverse climatic conditions. v y

Furthermore, any backing sheet of writing paper of lightweight is suitable for t ansitswith layer of the. heating composition aescnised hereinafter. v

This relatively light weightpaii'en wheri itjj coated with a layer. of said coating doinix'isition after drying of the solvent contained therein perfected with a protective sui'face edatiii' formed in situ. This coating comprises; a Tami} nated structure Of a skinlike film r'si'due'of a dried. layer of a hydrous smy-aieb-e'ei base deati'rig compound upon the paper surface. Such coated papersurfac'e is ndn tael zyjbut is' wh 'e'f-- washable and emulsifiable with water; t will retain ink of typewriter rese ed-auteu with type me through any kind of typewriter ribbon; in

legible condition in not, com and moist environ-' I It has beei ouiia that the preterm-a: white-- washable coatedpap'er surface structure, which can be madesothat it willrever'sibly swell andshrink andimbib water that is applied for rub bing and washing of! a portion of the treated paper surface, can be obtained by forming a. c"

herent, superficial, thin iilm resulting from drying a hydrous poly-alco-gel' 'coating'coliip'ound. The coating compound is comprised of a hydrous; colloidal suspension of finely dispersed particlesof tri-acetybarabino-galacto-dimethoxy-tetra; galactu roni-c acid (whose formula is 0461716205?- according to the chemical analysis of pectin re;

ported in the Bulletins -150 of 1916-1918 0f the Experimental Station ofthe Department of Agriculture of Washington State); which isa pectic substance possessinghigh viscosity and colloidal properties in solution, in aqueous sold: tion containing an isotonic solution ofthree chlorides, glycerin, and benzoic acid. L;

It is advisableqto incor orate the said pectic substance in its white formwhich is some cially available-in order to prepare the hydrgus' poly-alco-gel base compound required for ob'tai'n ing the preferredcoating composition. e quate softening ofthe prepared mass will be ob tained by itsldilution'with water. I

In order to provide a better writingfilm face, it is necessary to use a recently prepared coating composition, either of pasty jelly consistency, or creamy consistency, obtainable after agitating the mass of the used compound and softening, viz. by adequately diluting, with w ter- The specific materials used and their relative proportions may be varied according to the properties desired in the final product obtainable after removing excess coating composition, 1. c. after final striking off of the superfiuent part of the layer of the mass pasted or rolled upon the paper surface and then completely dried.

A product having all the above described properties is obtainable when at least the surface of one side of a sheet of preferred paper is coated with said coating composition, either of creamy consistencyprepared with all in redients, under not less first specified quantities or pasty jelly consistency-prenared with all ingradients, under not more last specified cuantities-obtained after admixing gradually allother ingredients, subsequently described.

The coating com osition comprises not less than three and a half per cent by weight, or not more than seven and a half per cent by weight of above specified pectic substance beside not less than seven and a half per cent by wei ht, or not more than eighteen per cent by weight of glycerin, and 0.02 per cent by weight of benzoic acid, and the remainder isotonic solution of three chlorides prepared according to the formula prescribed by U. S. P. XII, so that the solution contains in each 1000 ccm. from 820 milligrams to 900 milli rams of sodium chloride: NaCl, from milligrams to 35 milligrams of potassium chloride: K01, from milligrams to milligrams of calcium chloride: CaCl2-2H2O."

After complete dissolution of said chlorides in suflicient quantity of distilled water. boiled recently, the solution is filtered until clear after dissolution therein of the above specified quantity of benzoic acid.

For obtaining the "aforementioned coating composition, of creamy consistency, comprising the mixture of three and a half per cent by weight of above specified ectic substance and seven and a half per cent by Weight of glycerin to which should be added 89 per cent by weight of above specified isotonic solution of three chlorides and 0.02 per cent by weight of benzoic acid.

For obtaining the aforementioned coating composition of pasty jelly consistency, comprising sevenand a half per cent by weight of above specified pectic substance and eighteen per cent by weight of glycerin may be added '75 per cent by weight of above specified isotonic solution of three chlorides and 0.02 per cent by weight of benzoic acid.

Mix in a large container the preferred quantities of the above specified pectic substance and glycerin gradually added until all particles of said substance are covered with glycerin. Then while stirring, a-dd the previously prepared hot solution of the above specified isotonic solution of three chlorides and of benzoic acid, and continue stirring until a homogenous paste is formed and a pasteable emulsion is obtained.

[The emulsified coating composition must be adequately softened with recently boiled distilled water to proper coating consistency, before it can be applied to the paper surface base slightly wetted with the same water shortly before the application.

The coating composition diluted and softened to a coating consistency is placed in a vat, and either after rolling or floating it upon the paper base will be stricken oil with a spatula. The paper after being floated therein, is then passed over a doctor roll and dried in a low temperature drying oven according to the standard practice in the paper coating industry. Sheets have to be stacked and placed under pressure.

After drying, the sheets single folded and stacked, are flexible and could be rolled and smoothed down without sticking, cracking or breaking.

The paper surface provided with the coating has the property that typewriter face produced on it readily becomes deleted when washed off by rubbing with a small piece of wet rag or wet cotton.

The object of the invention is to provide an interesting reusable part of regular typewriter equipment for use with a toy-typewriter too. It

will also be of educational value, may be manufactured at low cost, and may be used repeatedly on account of the fact that its use keeps the typewriter clean.

The above objects are accomplished and other ends are attained by the novel composition of coating applied upon the surface of the part therein described. It is understood that the invention is capable of various adaptations and that changes or variations and modifications may be made or substitutions resorted to, which come within the scope of claim hereunto appended.

Having thus described my invention, what I claim as new, and wish to secure by Letters Patent is:

A new article of manufacture, a paper sheet having a coating on the surface thereof cornprising a laminated structure of a dry film resi due resulting from drying a paper sheet after having its surface coated by applying thereupon alayer of a hydrous poly-alco-gel base coating composition comprised of not less than three and REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT Number Name Date 7 1,961,866 ROOkBI June 5, 1934 2,287,849 Wilson June 30, 194:2

OTHER REFERENCES Pectin in Nature and Industry, by G. L. Baker; Scientific Monthly, Jan. 1935, pages 48-54.

Pectin, Its Manufacture, Properties & Uses, compiled by W. D. Elwell, Jan. 1939, page 34. 

